package com.sqm.a4;

/**
 * @Author sun.qingmeng
 * @Date 2021/2/10 10:34 下午
 * 给出 exR1(6) 的返回值:
 */
public class Ex_1_1_16 {
    public static String exR1(int n)
    {
        if (n <= 0) return "";
        return exR1(n-3) + n + exR1(n-2) + n;
    }

    public static void main(String[] args) {
        System.out.println(exR1(6));
    }
}
